<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        table,td{
            border: 5px solid green;
        }
        table{
            border-collapse: collapse;
            /* width: 300px;
            height: 300px; */
        }
        td{
            text-align: right;
            vertical-align: bottom;
            padding: 10px;
            background-color: yellow;
            color: blue;
        }
    </style>
</head>
<body>
   <table>
    <tr>
        <td>单元格</td>
        <td>单元格</td>
        <td>单元格</td>
    </tr>
    <tr>
        <td>单元格</td>
        <td>单元格</td>
        <td>单元格</td>
    </tr>
    <tr>
        <td>单元格</td>
        <td>单元格</td>
        <td>单元格</td>
    </tr>
   </table>
</body>
</html>